メス堕ち！オレのネトリ棒で淫らに喘ぐ先輩＆後輩妻 ～ムッチリ肉厚の巨乳妻たちとのハメハメラブライフ～

The main character is an ordinary salaryman.

He had feelings for Mai Hidaka, a senior coworker who served as his mentor during his trainee period. However, she got married after his training ended, so he gave up on her.

Though his senior seemed to have been living a happily married life, he recently noticed she'd been sighing a lot more. While trying to cheer her up and offer advice, he began to recall his past feelings for her.